ABSTRACT

Aboveground biomass (AGB) and the distribution of carbon stock was assessed in a swath of territory along the Indo-Bhutan border. This tract between Brahmaputra river’s floodplain and foothills of Eastern Himalayas, is a part of the Indo-Bhutan biodiversity hotspot. Using Landsat satellite data, the analysis assessed spatio-temporal landuse/landcover changes during 1989 and 2019. AGB and carbon stock were estimated using a forest inventory. Total AGB losses were 21.44 and 7.24 Mt in India and Bhutan respectively. Tree density ranged between 107–350 and 253–853 trees ha⁻¹ in India and Bhutan respectively and tended to decrease with increasing tree diameter. Anthocephalus Chinensis (76 trees ha⁻¹), Aphanamixis Polystachya (64), Syzygium Formosum (62) were the most dominant species in India while Quercus Spp (249 trees ha⁻¹), Abies densa (190), Rhodendron (155) dominated in Bhutan. AGB and carbon losses were more marked in India than Bhutan. Land cover changes were not uniformly spatially distributed throughout the study area and dense forests in India decreased at a rate seven times that of Bhutan’s. Consequently, AGB losses in India were three fold those of Bhutan’s.

摘要

在印度-不丹边界沿线的一片领土上评估了地上生物量 (AGB) 和碳储量的分布。雅鲁藏布江泛滥平原和东喜马拉雅山麓之间的这片区域是印度-不丹生物多样性热点的一部分。该分析使用 Landsat 卫星数据评估了 1989 年和 2019 年期间的时空土地利用/土地覆盖变化。使用森林清单估算了 AGB 和碳储量。印度和不丹的总 AGB 损失分别为 21.44 和 7.24 公吨。印度和不丹的树木密度分别在 107-350 和 253-853 ha ^-1之间，并且随着树木直径的增加而趋于降低。中华花头草（76 棵树 ha ^-1)、Aphanamixis Polystachya (64)、Syzygium Formosum (62) 是印度最主要的物种，而 Quercus Spp (249 ha ^-1 )、Abies densa (190)、Rhodendron (155) 在不丹占主导地位。印度的 AGB 和碳损失比不丹更为显着。整个研究区域的土地覆被变化在空间上分布不均匀，印度茂密的森林减少的速度是不丹的七倍。因此，印度的 AGB 损失是不丹的三倍。